Maxim DS1312S+

Энергонезависимая оперативная память4,75 В ~ 5,5 В-40°C ~ 85°C

Overview

The DS1312S Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption. In addition to battery-backup support, the DS1312S performs the important function of monitoring the remaining capacity of the lithium battery and providing a warning before the battery reaches end-of-life. Because the open-circuit voltage of a lithium backup battery remains relatively constant over the majority of its life, accurate battery monitoring requires loaded-battery voltage measurement. The DS1312S performs such measurement by periodically comparing the voltage of the battery as it supports an internal resistive load with a carefully selected reference voltage. If the battery voltage falls below the reference voltage under such conditions, the battery will soon reach end-of-life. As a result, the Battery Warning pin is activated to signal the need for battery replacement.

Features

Applications

• NVSRAM Modules
• Point-of-Sale Systems
• Facsimile, Printers and Photocopiers
• Internet Appliances
• Servers
• Medical Instrumentation and Industrial Products
• Industrial USB Flash Drive
• eUSB, embedded USB module
• Ultra durable Flash Drive
• Security Flash Drive